Not sure if this has been mentioned already, but I didn't find it on a search.
When downloading a midlet on a Series 60 phone, only the first two parts of the midlet version number are shown. This means you can not tell the difference between versions that differ by only the third part of the version number.
e.g. if the midlet version number is 1.2.5, on Series 60 you only see 'v1.02'.
A minor bug, but quite annoying!